JPH0266760A - Tape sag processor in recording and reproducing device - Google Patents

Abstract

PURPOSE:To automatically cancel a tape sag and to prevent a damage by detecting a tape sag during rewinding from the rotation condition of a supply reel and a winding reel and controlling the action of a capstan motor and a pinch roller press-bonding mechanism. CONSTITUTION:When the rotation stop of a reel 21 is detected by a rotation detecting means during the tape rewinding from a winding reel 22 to a supply reel 21, a control means separates a pinch roller from a capstan 12 and reverses a capstan motor 13. As a result, the reel 22 is driven, and the tape sag between the capstan 12 and a head cylinder 11 is wound to the reel 22. When the tape sag is cancelled, the reel 21 starts the rotation by the traction of the tape wound to the reel 22. The rotation is detected by the rotation detecting means and the capstan motor 13 is stopped. Thus, the tape sag is automatically cancelled and the damage of the tape can be prevented.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention provides a device for recording signals on a magnetic tape or reproducing signals from a magnetic tape, in which tape slack occurs during tape rewinding. In this case, it relates to a device for winding up the tape slack.

(Prior Art) In recent years, video tape recorders (VTRs) have become smaller and smaller, especially 8mm VTRs that use magnetic tape with a width of 811 mm.
The TR has been realized to be extremely small and lightweight.

As VTRs become smaller and lighter, camera-integrated VTRs that have a camera section and a VTR section have been put into practical use.

In addition, by integrating the LCD color television and ■TR,
It is also possible to realize a portable image reproduction system. For such VTRs, there are strict demands for further miniaturization.

Therefore, as shown in FIGS. 41 and 42, a VTR has been proposed in which the depth of the device along the cassette insertion direction can be expanded or contracted depending on the mode (Japanese Patent Laid-Open No. 61-2716
No. 48 CG11B15/665]).

In the above VTR, a head cylinder (11) equipped with a rotating magnetic head is installed on a main chassis (1), and a reel chassis (2) is installed on the main chassis (1).
) is arranged so as to be slidable toward and away from the head cylinder (11), and a supply reel head 21) and a take-up reel stand (22) are arranged on the reel chassis (2). The reel chassis (2) is driven by a chassis drive mechanism (not shown) connected to a loading motor on the main chassis (1).

Also, a supply reel stand (21) and a take-up reel stand (22)
In order to drive the reel, a known reel platform driver is equipped with an oscillating idler connected to a capstan motor.

In the standby mode shown in FIG. 41, a part (A) of the reel chassis (2) protrudes from the main chassis (1), and in this state, the reel stand (21022) on the reel chassis (2)/ \Tape cassette (150) is loaded.

In the play mode shown in Fig. 42, the reel chassis (2
) slides toward the head cylinder (11) and inserts the head cylinder (1) into the opening (B) of the cassette (150).
1) has invaded. In this state, the magnetic tape is wound around the head cylinder (11), and signals are recorded or reproduced.

Therefore, in the above VTR, the depth can be reduced from <L, as shown in the figure, to L2, making it convenient to carry.

(Problem to be Solved) Similar to the above-mentioned VTR, the applicant has provided a reel chassis (2) slidably on the main chassis (1), and
As will be described later, we invented a VTR equipped with a pinch roller crimping mechanism and the like having a configuration different from the conventional one, but in the process, the following problems became apparent.

In other words, in ultra-compact recording and reproducing devices such as 8mm VTRs, the winding angle of the magnetic tape around the head cylinder is 270 degrees, which is larger than that of conventional VTRs (approximately 180 degrees); There is a lot of friction between the magnetic tape inside and the circumferential surface of the head cylinder. Therefore, during tape rewinding or rewinding playback, if the tape that is being passed around the cylinder surface is scratched, has oil on it, or has condensation, the brake may be applied to the tape. , the tape may stop on the circumference of the cylinder. In this case, since the tape is continuously fed out from the capstan toward the head cylinder, tape slack occurs between the capstan and the head cylinder.

In conventional VTRs, in such a case, the rotation of the capstan is stopped, and thereafter only operations such as ejecting or turning off the power are possible.

Therefore, if the tape is loosened and the VTR is tilted or an impact is applied to the VTR, the tape will largely deviate from the predetermined running path, causing the tape to hit the guide post etc. when taking out the cassette. There was a problem involved.

An object of the present invention is to provide a recording/reproducing apparatus in which when tape slack occurs during tape rewinding, the tape slack is automatically taken up immediately thereafter.

(Means for Solving the Problems) A tape slack processing device according to the present invention has a supply reel stand (2
1) and a rotation detection means for detecting the rotation of the take-up reel stand (22), respectively, and a capstan motor (13) and a pinch roller crimping machine m (8) based on the detection signals of the detection means.
).

(Function) When the rotation detecting means detects that only the supply reel stand (21) has stopped rotating during tape rewinding from the take-up reel to the supply reel, the control means detects the pinch based on the detection signal. The roller (81) is separated from the capstan (12) and the capstan motor (13) is reversed.

As a result, the take-up reel stand (22) is driven by the rotation of the capstan motor (13), and the capstan (1
The tape slack between 2) and the head cylinder (11>) is taken up on the take-up reel.

When winding the tape, the magnetic tape is moved by a pinch roller (81
) and the capstan (12), so it is taken up on the take-up reel in a free state.

After that, when the slack in the tape is eliminated, the supply reel stand (21) is pulled by the tape wound on the take-up reel.
starts rotating.

The start of rotation of the supply reel stand (21) is detected by the rotation detection means, and based on the detection, the control means stops the capstan motor (13).

As a result, all of the tape slack is wound onto the take-up reel.

(Effects of the Invention) According to the tape slack processing device according to the present invention, when tape slack occurs during tape rewinding, the tape slack is automatically taken up immediately after that, so when taking out a cassette, magnetic The tape will not get tangled with the guide post etc.

(Example) Hereinafter, an example in which the present invention is implemented in an 8 mm VTR will be described in detail based on the drawings.

It should be noted that the examples are for illustrating the present invention, and should not be construed as limiting the invention described in the claims or reducing its scope.

As shown in FIGS. 1 to 4, 8, and 9, the VTR is equipped with a main chassis (1) equipped with a head cylinder (11), a supply reel stand (21), and a winder. A reel chassis (2) equipped with a take-up reel stand (22) is arranged so as to be able to approach and separate from the head cylinder (11), and a holder elevating mechanism (120) is mounted on the reel chassis (2).
The cassette holder (20) is supported so as to be movable up and down.

1, 2 and 9, the reel chassis (2) is moved in the direction away from the head cylinder (11),
This is a state in which the cassette holder (20) is protruded from the main chassis (1) to the maximum extent and raised from the reel chassis (2) (eject mode), and in this state, the tape cassette (150) is ejected from the cassette input slot (10). The cassette is inserted into the cassette holder (20).

FIG. 3 shows a state (standby mode) in which the cassette holder (20) is pushed down from the eject mode and locked onto the reel chassis (2), and in this state, the depth Ll of the device is 103-1. .

Figures 4 and 8 show a state in which the reel chassis (2) is retreated from the standby mode to the head cylinder (11) IQl, and the tape loading mechanism, pinch roller crimping mechanism, etc. are operated as described later. It is. The retracting distance of the reel chassis (2) from standby mode is 16I, the depth L2 of the device after retracting the reel chassis is the minimum 87III11, and the width W is 10
91, and the height H is 321.

Chassis 3 The main chassis (1) is formed in a rectangular shape as shown in Figs. 10 and 18, and the reel chassis (2) has a large hollow in the center of the front end as shown in Figs. 16 and 19, and a head cylinder (11). A notch (23) is recessed in order to avoid contact with.

Main chassis (1) as shown in Figures 10 and 18
A pair of guide shafts (14) (15) are arranged parallel to each other on both sides of the reel chassis (2).
As shown in FIGS. 17 and 19, a pair of sliding members (24) (25) are arranged on both sides of the guide shaft (14) (15) and the sliding member (24) (
25) are slidably fitted into each other as shown in Figures 1 to 4, thereby guiding the movement of the reel chassis (2) on the main chassis (1) and regulating both moving ends. ing.

As shown in FIGS. 12, 15, and 18, a loading motor (31) is provided on the main chassis (1), and a driving worm gear (32) is attached to the output shaft of the motor (31).
) is attached. Moreover, on the main chassis (1), there is a power shaft (34) extending in the direction of movement of the reel chassis.
) is constructed, and both ends thereof are supported by bearings (37) and (38) so as to be rotatable and movable in the axial direction.

The driving worm gear (32) is attached to the power shaft (34) near the bearing (37) on the side of the loading motor (31).
) is fixed, and a worm (35) is fixed near the other bearing part (38).

Also, the beveled gear (33) of the power shaft (34) and the worm (
A tsuba (39) is fixed to the middle part of 35), and
A drive piece (141) constituting a holder lock release mechanism, which will be described later, is slidably fitted on the side of the helical gear (33) of the collar (39). Furthermore, the worm (
A pair of flanges (34a) (
34b) are fixed at intervals, and a mode lever (4), which will be described later, is locked between both flanges.

On the other hand, the reel chassis (2) is shown in Figures 16 and 19.
As shown in the figure, a rack (36) extending along the reel chassis movement direction is fixed facing the notch (23), and the rack (36) always meshes with the worm (35).

Therefore, as shown in Fig. 20, the loading motor (3
1) drives the helical gear (33), and the power shaft (
34) rotates in the direction of the arrow, the rack (36) is driven by the worm (35), and the reel chassis (2
) moves backward in a direction toward the main chassis (1), and when the loading motor (31) rotates in the reverse direction, the reel jersey (2) moves backward in a direction away from the main chassis (1).

On the main chassis (1), facing the left front end (2a) of the reel chassis (2), there is a first detection switch (
130) is arranged, and the reel chassis (
2) reaches the end of movement in the backward direction, the front end (2a
) turns the first detection switch (130) ON, thereby detecting the completion of loading of the reel chassis (2).

When the reel chassis (2) is driven, a thrust load acts on the power shaft (34), but as will be described later, the roller (44> that does not protrude from the mode lever (4)
) engages with the straight part (45a) of the guide groove (45),
Rotation of the mode lever (4) and therefore axial movement of the power shaft (34) are prevented (see FIG. 21).

5 As shown in Figure 10, in the center of the back of the main chassis (1) is a head cylinder (11) equipped with a rotating magnetic head.
, a capstan (12), a capstan motor (13) that drives the capstan, and a tape loading machine m (5) for winding the magnetic tape onto the head cylinder (11).
A cylinder unit (16) is provided.

The tape loading mechanism (5), as shown in FIG.
6a), and two ring gears (6) and (61) are arranged concentrically in two stages, upper and lower, and the ring gears (6) and (61) are each supported by a plurality of support rollers (64) so as to be freely rotatable. has been done.

An arcuate guide rail (57) (58) extending along the circumference of the head cylinder (11) is fixed to the upper part of both ring gears (6) (61). Each guide rail is provided with a guide groove (59) (60), and a pair of tape guides (52) (53) (55) (
A supply side leading body (51) and a winding side light guide (54) having a protruding portion 56) are fitted in a slidable manner.

The supply side leading body (51) and the winding side light guide (54) are
It is connected to two upper and lower ring gears (6) and (61) via connecting pieces (62) and (63) shown in FIG. 11, respectively. Therefore, as the ring gear (6061) rotates in opposite directions, the image guide body (51) (54) moves forward and backward on the guide rail (57> (58)).

The ring gears (6) and (61) are shown in Figs. 12 and 20.
As shown in the figure, the worm (3) is connected to the worm (3) via a gear mechanism (7).
5). The gear mechanism (7) has a worm (
35) toward the ring gears (6) (61), the first, second, third, fourth, and fifth gears (71) (74)
It is composed of (77) (78) (79).

Each gear has gear parts formed in upper and lower stages, and the first to third gears (71), (74), and (77) rotate integrally, whereas the fourth gear rotates integrally. (78
) and the fifth gear (79) are upper gears (78a) (79a) and lower gears (78b) (79), respectively, as shown in FIG.
b) are rotatably and concentrically supported independently of each other, and the torsion springs (78c) (79c
) are connected.

The lower gear (72) of the first gear (1) is a worm wheel that meshes with the worm (35), and the upper gear (72) is a worm wheel.
73) meshes with the lower gear (75) of the second gear (74). Further, the upper gear (76) of the second gear (74) is connected to the upper gear (77a) of the third gear (7).
The lower gear (77) (7b) meshes with the lower gear (78a) of the fourth gear (78). The upper gear () 8b) of the fourth gear (78) is the upper gear (79) of the fifth gear (79).
a) and the upper ring gear (6), and the lower gear (79b) of the fifth gear (79) partially meshes with the lower ring gear (61).

As shown in FIG. 20, the upper gear (7) of the first gear (71)
3) and the lower gear (
75) means that teeth are formed on a part of the peripheral surface, and the upper gear ()
3) Part of the circular convex surface () 3a) having a tip circle radius
is formed, and a part of the lower gear (75) is formed with an arcuate concave surface (75a) having a curvature equal to that of the arcuate convex surface, and the arcuate convex surface (73a) and the arcuate concave surface (75a) have a second arcuate concave surface.
As shown in Figure 1, when the loading of the reel chassis (2) is completed, they engage with each other to form an intermittent rotation mechanism.

Also, as shown in Fig. 24, the last tooth () of the upper gear (3)
The rising surface from the tooth bottom to the arcuate convex surface (73a) has a normal tooth profile curve indicated by a two-dot chain line, for example, a pressing surface (73b) that is inclined toward the arcuate convex surface (73a) than the involute tooth profile. It is formed. Therefore, as shown in the figure, the upper gear (73) of the first gear (71) and the second gear (73)
4) Immediately before the engagement with the lower gear (75) ends, the pressing surface (73b) of the lower gear (75) engages the second gear (
74) When pressing the last tooth (75a) of the lower gear (75) to rotate the second gear (4) by the final slight angle, the common normal at the contact point of the tooth surface and The point of intersection with the line connecting the rotation centers of both gears is biased toward the first gear (71) than when the tooth surfaces normally mesh, and as a result, the first gear (71)
The angular velocity ratio of the second gear (74) to the second gear (74) is lower than when the tooth flanks are normally engaged. Along with this, the second gear (74)
The rotational torque of is increased.

Note that it is desirable that the last tooth surface of the lower gear (75) of the second gear (74) also have a tooth profile corresponding to the pressing surface (73b).

In the standby mode shown in FIG. 20, when the first gear (71) rotates clockwise, the second and third gears (74) (
77) After (78), the upper ring gear (6) rotates clockwise to move the supply-side leading body (51) clockwise. On the other hand, the lower ring gear (61) is rotated counterclockwise by the drive of the fifth gear (79).
The winding and opening member (54) is moved counterclockwise.

As a result, in the standby mode shown in FIG. 5, the supply side leading body (51) and the winding/spreading body (54) located inside the magnetic tape (151) of the cassette (150) move along the guide rail. Move and pull the magnetic tape out of the cassette. Thereafter, the image guide body is moved to the end of the movement shown in FIG. 6 by a stopper (
11 (57a) (58a)), and the magnetic tape (151) is positioned against the head cylinder (11).
) is wrapped at a predetermined angle (270 degrees), and tape loading is completed.

When the image guide bodies (51) and (54) hit the stopper, the first gear (71) and the second gear (74) enter the meshing state shown at =16 in Fig. 24, and from this state the loading motor (31) overruns and rotates, thereby causing the pressing surface (73) of the upper gear (73) of the first gear (71) to rotate.
b) presses the lower gear ( ) 5) of the second gear (74), and the rotational torque of the second gear (74) increases as described above.

This increased rotational torque causes the gear mechanism (7) to further operate, and as a result, the torsion spring (78e) shown in FIG.
) (79e) is elastically deformed, and due to the elastic force, the upper gear (78b) of the fourth gear (78) and the fifth gear (79)
The lower gear (79b) is urged to rotate, thereby bringing the supply side and winding/opening bodies (51, 54) into pressure contact with the stopper.

Even if the first gear (71) further rotates clockwise from the above state, the upper gear (71) of the first gear (71) as shown in FIG.
Since the arcuate convex surface (73a) of )3) and the arcuate concave surface (75a) of the lower gear (75) of the second gear ()4) engage, the first gear (71) idles and the second gear ( 74) Do not transmit rotational force to subsequent gears. At this time, a clockwise rotational force acts on the second gear (74) due to the reaction force of the torsion spring (79c), but the arcuate convex surface (73a)
) and the arcuate concave surface (75a) are engaged, the second gear (74) does not rotate.

In the above-mentioned tape loading mechanism (5), the important operation is that even after tape loading is completed, the leading body (5)
1) While holding (54) at the moving end on the guide rail, move the loading motor (31) with the arcuate convex surface of the first gear (71) engaged with the arcuate concave surface of the second gear (74).
The worm (35) can be rotationally driven by this. Therefore, as will be described later, the rotation of the worm (35) is converted into axial movement of the power shaft (34), and the pinch roller crimping mechanism (8), which will be described later, can be operated for crimping.

Pin Row-8 As shown in Figure 16 and Figures 25 to 27, a pinch roller (81) is located on the upper right side of the reel chassis (2).
) with a protruding pinch roller lever (82) and a driving lever (83) are coaxially supported and freely rotatable independently of each other, and a spring (8
5) is stretched.

A pinch roller lever (81) is provided at the free end of the pinch roller lever (82) to protrude in the -E direction, and a cam follower (84) is provided to protrude downward from the free end of the drive lever (83). An engagement pin (83a) is provided protruding near the cam follower (84). The cam follower (
84) passes through an arcuate hole formed in the reel chassis (2) and connects to a cam groove (86) provided on the main chassis (1).
). Further, the engagement pin (83a) is connected to an end of a slider (87), which will be described later.

Further, a take-up side pull-out lever (98) is pivotally supported on the reel chassis (2) at a position eccentric from the center of rotation of the pinch roller lever (82), and the lever (98) and the pinch roller lever lever (82) are connected to each other. ) are pivotally connected by a connecting link (80). A pin (97) for hooking the magnetic tape in the cassette and pulling it out from the cassette is provided at the free end of the take-up side pull-out lever (98) to protrude upward.

The cam groove (86) of the main chassis (1)l has a 25th
As shown in the figure, the drive slope (86a) is inclined toward the center of the main chassis along the retreat direction of the reel chassis (2), and the end of the drive slope (86a) on the caps tank 12) is parallel to the retreat direction. A parallel surface (86b) that extends and a relief surface (86c) that tilts further toward the center of the main chassis from the end of the parallel surface (86b) are formed.

Therefore, in the process of the reel chassis (2) moving back from the standby mode shown in FIG. 25 to the loading completion state (ready mode) shown in FIG. 26, the cam follower (84
) is pressed by the driving slope (86a) of the cam groove (86), the drive lever (83) rotates clockwise, and the pinch roller lever (82) and the take-up side pull-out lever (98) are rotated accordingly. Rotate clockwise.

When the loading of the reel chassis (2) is completed as shown in FIG. 26, the pinch roller (81) will be positioned slightly in front of the capstan (12).

At this time, the cam follower (84) faces the flank (86e) of the cam groove (86), and in this state, the cam follower (84) is unrestrained and the drive lever (83) can freely rotate clockwise. becomes.

Furthermore, as shown in FIGS. 16 and 25, a slider (87) extending left and right along the chassis notch (23) is provided on the front edge of the reel chassis (2).
) is supported so as to be movable within a predetermined range in the left-right direction. The engagement pin (83a) of the drive lever (83) is connected to the right end of the slider (87), and the slider drive pin (41) of the mode lever (4) described later is connected to the left end of the slider (87). ) engagement receiving part (88)
is recessed. Furthermore, a pin (89) for driving a regulating plate (160), which will be described later, is provided in the center of the slider to protrude downward.

The mode lever (4) is as shown in Figs. 15, 22 and 23.
As shown in the figure, the support shaft (40) on the main chassis (1)
A slider drive pin (41) is provided protruding from the free end on the chassis center side, and second and third detection switches (13), which will be described later, are provided on the other free end side.
1) A first protrusion (42) and a second protrusion (43) for turning on (132) are formed into two forks.

Further, a driven portion (46), which is sandwiched between the pair of flanges (34a) and (34b) with play in the axial direction, protrudes from the engagement portion of the mode lever (4) with the power shaft (34). has been done. Furthermore, a roller (44) is provided on the upper surface of the mode lever (4) in the vicinity of the second projecting piece (43), and the roller (44) is formed on the back surface of the reel chassis (2) as shown in FIG. It engages with the guide groove (45).

The guide groove (45) has a straight part (45a) for keeping the mode lever (4) in a constant position when moving the reel chassis.
) is formed, and the reel chassis (2)
When the mode lever (4) is moved back to the loading completion position shown in the figure, the first slope (45b) allows the mode lever (4) to rotate counterclockwise. A second slope (45c) is formed to allow rotation of the second slope.

If the power shaft (34) is further rotated in the direction of the arrow by the driving of the loading motor (31) after the loading of the reel chassis (2) shown in FIG. 21 is completed, the reel chassis (2) can no longer move backward. Ohm (35
) receives a thrust in the direction in which the reel chassis protrudes (downward in Fig. 22) through engagement with the rack (36) in the locked state, which causes the power shaft (34) to move in the direction in which the reel chassis protrudes. .

As a result, the mode lever (4) is driven counterclockwise as shown in FIG. 22.

From the standby mode shown in Figure 25, the reel chassis (
2) retreats and the driving lever (83) rotates clockwise as described above, the slider (87)
The slider (8) slides to the left when the reel chassis loading is completed as shown in Figure 26.
The engagement receiving portion (88) of the mode lever (4) engages with the slider drive pin (41) of the mode lever (4).

From this state, the mode lever (4) rotates counterclockwise due to the axial movement of the power shaft (34).
The slider (8) is pulled by the slider drive pin (41) and slides from the position shown in FIG. 26 to the position shown in FIG. 27. At this time, as shown in Figure 22, the mode lever (
The roller (44) of the guide groove (44)
5b), counterclockwise rotation of the mode lever (4) is permitted.

Along with this, the driving lever (83) and the pinch roller lever (82) are driven clockwise from the state shown in FIG.
1), and by slightly moving the slider (87), the spring (85) interposed between the drive lever (83) and the pinch roller lever (82) ) is stretched, and the biasing force of the spring (85) presses the pinch roller (81) onto the capstan (12) via the magnetic tape (151). At this time, the driving lever (83)
It is no longer restrained by the cam groove (86) and can freely rotate clockwise.

When the pinch roller crimping operation is completed, the first protrusion (42) of the mode lever (4) turns the second detection switch (131) ON as shown in FIG. 22, thereby stopping the loading motor (31).

When the loading motor (31) reverses from the state shown in Fig. 22, the power shaft (34) moves in the same direction due to the upward thrust acting on the worm (35), and the mode lever (4) moves in the same direction. is driven clockwise.

At this time, the roller (44) provided on the mode lever (4)
is in contact with the first slope (45b) of the guide groove (45) on the reel chassis (2) and prevents the reel chassis (2) from moving in the unloading direction.
35) does not drive the reel chassis (2).

Therefore, first, the power shaft (34) moves in the axial direction and the mode lever (4) is driven to the state shown in FIG.
) from the first slope (45b) of the reel chassis (
After the movement of the reel chassis (2) is allowed, the power of the worm (35) is transmitted to the rack (36), and unloading of the reel chassis (2) is started.

Back Tension Lever 9 As shown in FIG. 16, a back tension lever mechanism (9) is provided at the upper left side of the reel chassis (2).

In this mechanism, a back tension lever (92), which has a protruding pin (91) for hooking the magnetic tape in the cassette, is attached to the reel chassis (21), facing the supply reel stand (21).
2) It is pivoted above. A cam follower (93) is provided protruding downward near the center of rotation of the lever (92). Main chassis (1
) is engaged with the cam groove (95) on the top.

Pack tension lever (92) and reel chassis (2)
) is tensioned between the pack tension lever (92) and biases the pack tension lever (92) in the opening direction.

Furthermore, a brake band (94) is attached to the base end of the cam follower (93) to be wrapped around the circumferential surface of the supply reel stand (21).
) are connected at one end.

As shown in FIG. 28, the cam groove (95) includes a guide slope (95a) that slopes away from the center of the main chassis along the backward direction of the reel chassis (2), and a rear end of the guide slope. A parallel plane (
95b), and a relief surface (95c) extending outward from the chassis at a substantially right angle from the end of the parallel surface (95b).

Therefore, when the reel chassis (2>) moves backward from the standby mode shown in FIG.
93) moves along the guide slope (95a) of the cam groove (95), and as a result, the pack tension lever (92) moves in the biasing direction of the spring (99), that is, counterclockwise, as shown in FIG. As it rotates, the pull-out pin (91) pulls out the magnetic tape (151) from the cassette.

Also, with the rotation of the pack tension lever (92),
The brake band (94) is in sliding contact with the circumferential surface of the supply reel stand (21), and in this state, the pin (91) serves as a tension detection section to adjust the tension of the brake band (94).
As a result, appropriate tension is applied to the magnetic tape (151). At this time, as shown in Fig. 30, the cam follower (93) faces the flank (95c) of the cam groove (95), and the pack tension lever (92) is free to rotate counterclockwise, that is, in the tension applying direction. It has become. Therefore, in the process of tension adjustment, the cam follower <
93) performs reciprocating movement between the flank (95c) and the parallel plane (95b) facing the flank.

In the VTR of this embodiment, the capstan motor (1
A system is adopted in which the power of step 3) is transmitted to the take-up reel stand (22) or the supply reel stand (21) to drive these reel stands.

As shown in FIGS. 10 and 18, the main chassis (1) has first, second, third, and fourth gears (102) (1
Gear train (10) consisting of (03) (104) (105)
1) are arranged, and the first gear (102) is fixed to the output shaft of the capstan motor (13).

Further, the main chassis (1) is provided with a well-known oscillating idler (IIO) at the end of the gear train.

The oscillating idler (110) is equipped with a driving gear (111) that is constantly meshed with the fourth gear (1,05) as shown in FIG.
), and an idler gear (112) that is always in mesh with the driving gear (111) is provided at the free end of the supporting arm. A friction member (not shown) is interposed between the arm (113) and the arm (113). Support arm (113)
A protruding piece (114) is formed toward the center of the chassis.

Further, in the center of the main chassis (1), a regulating plate (160) integrally molded with a six-component resin is provided on the side of the oscillating idler (110) so that it slides within a predetermined range in the left and right direction. movably supported. The regulation plate (160) includes:
A convex portion (161) is formed opposite to the projecting piece (114) of the oscillating idler (110), and the slider (
The pin (89) protruding from the cam wall (1
63). The cam wall (163) has an oscillating idler (11) along the reel chassis backward direction.
A slope inclined toward the 0) side is formed. Also, the regulation plate (16
0) is an idler (110) that swings the regulation plate body.
An elastic part (162) that urges the main chassis (1) is integrally formed, and the tip of the elastic part is locked to the main chassis (1).

On the other hand, as shown in FIGS. 19 and 28, there is a chassis notch (23
) A gear train consisting of a fifth gear (106), a sixth gear (107), and a reel drive gear (116) is arranged toward the take-up reel stand (22).

The reel drive gear (116) passes through the reel chassis (2), emerges from the top surface of the chassis, and connects to the take-up reel stand (22).
) is meshed with the gear portion (22a) of the

Further, on the back side of the central part of the reel chassis (2), a first relay gear (117) and a second relay gear (118) are arranged from the reel drive gear (116) side toward the supply reel stand (21).
) and a reel drive gear (119). The reel drive gear (119) is connected to the reel chassis (
It penetrates through 2) and emerges from the top surface of the chassis, and meshes with the gear (21a) of the supply reel 21).

In the standby mode shown in Figure 28, the capstan (
12) rotates counterclockwise, that is, in the tape winding direction, the oscillating idler (110) accordingly oscillates counterclockwise, and the idler gear (112) rotates in the reel chassis (as shown in the figure). 2) Upper fifth gear (106
).

Therefore, the rotation of the capstan motor (13) is controlled by the oscillating idler (110), the fifth gear (106), and the sixth gear (
107) and is transmitted to the take-up reel stand (22) via the reel drive gear (116), and the reel stand rotates clockwise to wind up the tape.

When the reel chassis (2) moves backward toward the head cylinder (11) from the state shown in Fig. 28, in this process, the idler gear (112) of the oscillating idler (110) shifts to the fifth When the gear (106) and the reel drive gear (116) are engaged simultaneously, and the reel chassis (2) is further retreated to the loading completion position, the third
As shown in Figure 0, the idler gear (112) is the fifth gear (10
6) and meshes only with the reel drive gear (116).

In addition, as shown in FIGS. 25 to 26, in the process of the reel chassis (2) moving backward, the slider (87)
The bottle (89) protruding from the cam wall (
163), and the regulation plate (160) is brought into contact with the elastic part (162).
) to move it slightly to the left. In the state shown in FIG. 26, the convex part (161) of the regulating plate (160) slightly advances into the oscillating area of the oscillating idler (110), and the protruding part (161) of the oscillating idler (110) 144), thereby regulating the clockwise rotation end of the oscillating idler (110). As a result, the idler gear (
112) is maintained in a non-meshing state with the first relay gear (117).

In addition, in the state shown in Fig. 26, the capstan (1
2) is rotating clockwise, that is, in the tape rewinding direction, and a clockwise swinging force is applied to the swinging idler (110).
112) does not mesh with the reel drive gear (116).

As a result, the idler gear (112) is maintained in a neutral state in which it does not mesh with either the first relay gear (117) on the supply reel stand side or the reel drive gear (116) on the take-up reel stand side.

In addition, this neutral state allows both reel stands to rotate freely,
This is set to pull out the magnetic tape from both reels of the cassette when loading the reel chassis (2), and the magnetic tape is pulled out from both reels by this V.
In TR, the magnetic tape is wound around the head cylinder at a large angle, so there is a lot of friction between the head cylinder and the magnetic tape, and pulling out the magnetic tape from both reels prevents damage to the magnetic tape due to the friction. It is.

Thereafter, in the process of retracting the reel chassis (2) from the position shown in FIG. 26 to the play mode position shown in FIG. Press the wall (163) to move the regulation plate (160) to the left. As a result, the protrusion (161) of the regulation plate (160)
1G), the oscillating idler (110) is allowed to oscillate in the left-right direction.

When the capstan (12) rotates counterclockwise in the state shown in Fig. 30, the take-up reel stand (22) is driven clockwise, and the tape is wound during normal playback or fast forwarding. .

Also, when the capstan (12) rotates clockwise,
The oscillating idler (110) performs a clockwise oscillating motion, and the idler gear (112) is disengaged from the reel drive gear (116) as shown in FIG.
21) meshes with the first relay gear (117).

Then, the clockwise rotation of the idler gear (112) is caused by the supply reel stand (
21), which drives the supply reel stand (21) counterclockwise, thereby winding the tape during rewind playback or tape rewinding.

Hull-120 As shown in Fig. 17 and Figs. 32 to 34, a holder elevating mechanism (1
A cassette holder (20) is supported via the cassette holder (20).

The holder elevating mechanism (120) is a cassette holder (2
0), and each link mechanism has a first arm (123) and a second arm (124) arranged so as to intersect with each other. Both Arnos are connected at a point so that they can freely rotate relative to each other. Cassette input port (10) of the first arm (123)
The base end of the side is rotatably fitted into the support hole (20a) provided in the side plate of the cassette holder (20), and the tip part is fitted into the guide hole (127) which is long in the horizontal direction in the side plate of the reel chassis (2). to be slidably fitted.

The base end of the second arm (124) on the side of the cassette input port (10) is rotatably fitted into the support hole (12B) provided in the side plate of the cassette holder (20), and the tip end is fitted into the support hole (12B) on the side plate of the cassette holder (20). ) has a long horizontal guide hole in the side plate (
20b).

A spring (125) is stretched between the first arm (123) and the second arm (124).

As a result, the cassette holder (20) is supported on the reel chassis (2) so as to be movable up and down, and is urged in the upward direction.

Holder lock January ship) As shown in Figures 32 to 34, the holder lifting mechanism (12
The link mechanism on the left side of the cassette holder (20
) in the lowered position. Holder lock mechanism (1)
40) are linked.

The holder lock mechanism (140) is connected to the second arm (124).
) is further extended toward the main chassis (1), and a lock pin (128) is provided at the extended end to protrude toward the inside of the holder.

On the other hand, the side plate of the cassette holder (20) has a lock arm (
146) is rotatably supported and biased counterclockwise by a spring (170) stretched between the reel chassis (2) and the reel chassis (2). A locking piece (147) that can be engaged with the lock pin (128) is provided at the free end of the lock arm (146).
At the same time, a pressing pin (148) is provided protruding outward near the locking piece (147). Note that the lock arm (146) is regulated at its counterclockwise rotation end by a stopper (129) provided on the cassette holder (20).

Further, at the rear end of the side plate of the reel chassis (2), facing the pressing pin (148) of the lock arm (146),
A cam portion (29) is formed that tilts low toward the rear.

Therefore, when the cassette holder (20) is pushed down from the eject mode shown in FIG. 34, the pressing pin (148) hits the cam portion (29) and the lock arm (146) rotates slightly clockwise. At the same time, the second arm (
124) rotates toward a horizontal position. When the cassette holder (20) is further pushed down to the lowering end, the pressing pin (148) separates from the cam portion (29) as shown in FIG. 32 and rotates counterclockwise under the bias of the spring (170). As a result, the locking piece (14) of the lock arm (146)
7) is the lock pin (128) of the second arm (1, 24)
Regarding this, place the cassette holder (20) at the lower end.
Link.

Furthermore, a pressing pin (148) is provided on the inner surface of the cam portion (29).
) A fourth detection switch (133) is provided at a lower position. The switch is closed by the press pin (148) when the cassette holder (20) is locked as shown in FIG. 32, and detects the holder locked state. Based on the detection, loading of the reel chassis is started.

Holder lock, Holder lock @ structure (140) is unlocked by rotating the lock arm (146) counterclockwise by moving the slide plate (144) provided on the main chassis (1), and releasing the locking piece. This is done by releasing the engagement between (147) and lock pin (128).

As shown in FIGS. 21 and 23, the slide plate (144) is disposed on the side of the power shaft (34) so as to be slidable within a predetermined range along the moving direction of the reel chassis (2). It is biased toward the reel chassis (2) by a torsion spring (145) on the chassis (1). On the slide plate (144), at the end on the reel chassis (2) side,
The first protrusion (1) to be engaged with the lock arm (146)
71) is formed, and a second protruding piece (172) is formed at the end opposite to the first protruding piece, with which the negative free end of the driven lever (143) to be described later engages. .

The slide plate (144) supports a driven lever (143) and a driving lever (142) that are pivotally supported on the main chassis (1).
) via the drive piece (14) fitted to the power shaft (34).
1). One of the pair of engaging parts formed back to back on the free end of the drive lever (142) is connected to the drive piece (141).
), and the other engaging part is the driven lever (143).
abut one free end of the In addition, the driven lever (14
The other free end of 3) is located above the slide plate (144).
and attach the extended end to the slide plate (144) with the second projecting piece (
172).

As shown in FIG. 20, when the loading of the reel chassis (2) is completed, the loading motor (31
) further rotates the power shaft (34) in the direction of the arrow, the reel chassis (2) can no longer move forward, so the worm (35) moves from the rack (36) in the locked state.
), the reel chassis moves in the backward direction (20th
The power shaft (34)
The reel chassis will move in the backward direction. As a result, the mode lever (4) is driven clockwise as shown in FIG. At this time, the roller (4) of the mode lever (4)
4) faces the second slope (45c) of the guide groove (45) and allows the mode lever (4) to rotate clockwise.

As the power shaft (34) moves in the axial direction as described above, the drive piece (141) moves the drive lever (
142) counterclockwise, and the driving lever (142) is driven counterclockwise.
) drives the driven lever (143) counterclockwise, and the driven lever (143) moves the slide plate (144) against the spring (145).

When the slide plate (144) moves in the reel chassis backward direction in this way, the first protrusion (144) moves as shown in FIG.
71) presses against the free end (149) of the lock arm (146) and rotates the lock arm clockwise.

This causes the locking piece (147) to lock the lock pin (128).
), and the cassette holder (20) is unlocked. As a result, the cassette holder (20) is raised by the bias of the spring (125) as shown in FIG. At the same time, the lock arm (146) returns to the counterclockwise rotation end.

Thereafter, as will be described later, the slide plate (144) is returned to the reel chassis (2) side as shown by the two-dot chain line in FIG. 34, thereby enabling the next holder locking operation.

When the power shaft (34) is rotated in the opposite direction of the arrow by driving the loading motor (31) from the state shown in FIG. the mode lever (4) returns to the position shown in Fig. 20,
The slide plate (144) returns to the position shown in FIG. 32.

In the state shown in Fig. 23, the roller (44) of the mode lever (4)
) is the second slope (4) of the guide groove (45) on the reel chassis.
5c) to prevent the reel chassis from moving backward, the reel chassis will not move due to the drive of the ohm (35).

Therefore, first, the power shaft (34) is moved in the axial direction, and the mode lever (4) is driven to the state shown in FIG. 20. Then, the roller (44) of the mode lever (4) separates from the second slope (45c) of the guide groove (45), and after the reel chassis (2) is allowed to move, the worm (35
) is transmitted to the rack (36), and loading of the reel chassis (2) is started.

In order to hold the cassette holder (20) at a predetermined height position on the main chassis (1) in the state shown in FIG. 32, the following holder positioning mechanism is employed.

As shown in FIGS. 9, 10, and 17, an engagement pin (12
1) is provided to protrude outward.

On the other hand, on the main chassis (1), at the rear end on the right side,
There is a 0-shaped engagement piece (12) that opens toward the front of the main chassis.
2) is provided protrudingly. The position of the engagement receiving piece (122) is determined so that the engagement pin (121) is tightly fitted when loading of the reel chassis (2) is completed as shown in FIG.

Therefore, the left side plate of the cassette holder (20)
In the state shown in the figure, lock arm (146) and lock pin (
128), it is held at a predetermined height position on the main chassis (1), and this held state is maintained even when loading is completed and in the play mode as shown in FIG. Further, the right side plate of the cassette holder (20) is positioned at a predetermined height position on the main chassis (1) by engagement between the engagement pin (121) and the engagement receiving piece (122) as shown in Fig. 4. be detained.

As a result, in play mode, the cassette holder (2
The tape cassette in 0) is held horizontally at a predetermined height position on the main chassis (1), and the engagement pin (121) is electrically connected to the cassette holder (20). At the same time, the engagement receiving piece (122) is electrically connected to the main chassis (1). As a result, the cassette holder (20) is grounded to the main chassis (1), and the inside of the cassette holder (20) is magnetically shielded. Therefore, in play mode, the cassette holder (2
0) will be surrounded by the head cylinder (
11) The magnetic head and mouth-to-tally transformer are protected from external magnetic noise.

To Rainbow To 1 As shown in Fig. 8, on the front edge side of the central part of the reel jersey (2), there is a reel lock release piece (26) for unlocking the reel lock mechanism (not shown) provided in the cassette. )
is installed protrudingly.

In addition, the reel jersey (2) is provided with a light emitting element (134) on the rear edge side of the central part, and a tape end sensor (134) and a tape top sensor that receive light from the light emitting element are installed on both sides of the chassis. (137) is provided, so that in the play mode, the cassette in the cassette holder (20) is at the tape end state where the magnetic tape is completely wound onto the take-up reel, or when the magnetic tape is completely wound onto the take-up reel. It is detected whether the top of the tape is rewound onto the reel.

As shown in FIG. 9, the second arm (124) on the right side that constitutes the holder elevating mechanism (120) has an arc-shaped gear piece (17
3) is provided protrudingly, and on the reel chassis (2), a cassette holder (
20) A damper that adds appropriate resistance to the upward movement of (1
74) is provided.

Further, as shown in FIG. 19, the reel chassis (2> has a supply reel rotation sensor (13B) and a take-up reel rotation sensor ( 139) is arranged to detect the rotation of each reel.The rotation sensor (138) (1
39) is constituted by, for example, a photoreflector.

1st Commandment 4 FIG. 35 shows the configuration of a control circuit that controls the operations of the capstan motor (13) and loading motor (31).

The system controller (180) that controls the operation of the VTR in various modes is composed of a microcomputer, and the input board includes the aforementioned first to fourth detection switches (130) (131) (132) (133) ( 134
), cassette discrimination switch (135), tape end sensor (136), tape top sensor (137),
A supply reel rotation sensor (138) and a take-up reel rotation sensor (139) are connected, and a capstan motor (13) and a loading motor (3) are connected to the output boat.
Drivers (13) that generate drive voltages for 1)
a) (31a) is connected.

The system controller (180) is set with a computer program for performing mode transition operations, which will be described later, based on command signals from various operation keys (not shown) provided on the operation panel of the VTR. As will be described later with reference to FIGS. 40 to 40, a computer program is set for performing operations specific to the VTR of the present invention.

In the case of a 1-capacity VTR, there is an eject mode in which the cassette holder rises and the tape cassette can be inserted, and a standby mode in which the cassette boulder is pushed down and locked on the reel chassis in the eject mode. , a play mode in which reel chassis loading, tape loading, pinch roller crimping operations, etc. are performed from the standby mode, and signal recording and playback is possible; a stop mode in which the rotation of the head cylinder and capstan is stopped in the play mode; A total of five modes are set, including a play mode, a stop mode, and a ready mode in which the pinch roller is released from pressure.

■ Transition from standby mode to ready mode (loading complete state) In standby mode with the cassette holder (2o) locked on the reel chassis (2) as shown in Figure 3, when a loading command is issued from the operation panel, The loading motor (31) starts and the reel chassis (2
) is moved back from the standby mode position shown in Fig. 5 to the loading completion position shown in Fig. 6, and in this process the first detection switch (130) is turned on as shown in Fig. 21, the pack tension lever ( 9
2) As the take-up side pull-out lever (98) and pinch roller lever (82) open in the tape pull-out direction, the supply side and take-up side guide bodies (51, 54) move, and the magnetic tape is removed as shown in the figure. (151) is stretched along a predetermined route. Further, the mode lever (4) and the slider (87) engage with each other.

■ Transition from ready mode to play mode When the loading motor (31) continues to rotate in the ready mode shown in Fig. 6, the power shaft (34) moves in the axial direction as shown in Figs. 21 to 22. mode lever (4)
) pulls the slider (87) and presses the pinch roller (81) onto the capstan (12) via the magnetic tape (151) as shown in FIG.

As a result, the second detection switch (13
1) is ONL, and the ON signal is the system controller I.
\ and the loading motor is stopped.

In the play mode shown in Figure 7, head cylinder cylinder 11)
The capstan motor (13) rotates to record or reproduce signals.

In the play mode, the capstan (12) is rotated at high speed to fast-forward or rewind the tape.

■ Transition from play mode to stop mode When a command to transition to stop mode is issued from the operation panel, the head cylinder (11) and capstan (12) stop rotating. The reel chassis (2) maintains the position shown in FIG.

■ Transition from Play mode or Stop mode to Ready mode If tape slack occurs between the capstan and head cylinder when rewinding the tape as described later, the 6th
A ready mode in which the pinch roller shown in the figure is released from pressure is set.

In this case, by driving the loading motor (31),
The power shaft (34) is driven axially from the position of FIG. 22 to the position of FIG. 21. Accordingly, the slider (87) moves to the right as shown in FIGS. 27 to 26, and the pinch roller (81) is released from the capstan (12). The time when the crimp was released was the 21st
It is detected when the first detection switch (130) shown in the figure is opened, and the detection signal causes the loading motor (
31) is stopped.

■Transition from ready mode to standby mode By rotating the power shaft (34) in the direction opposite to the arrow from the state shown in FIG. 21, the reel chassis (2) is driven to the standby mode position shown in FIG. 20.

Further, since the first gear (71) is rotated counterclockwise by the drive of the ohm (35) from the state shown in FIG. 21, the arcuate convex surface of the upper gear (73) of the first gear (71) becomes (73a ) The second gear (74) separates from the arcuate concave surface (75a) of the lower gear (75), and the upper gear (73) and lower gear (75) begin to engage their tooth surfaces. Therefore,
The rotation of the worm (35) is transmitted to both ring gears (6) (61) via gear mechanism II (7), and
As shown in the figure, the supply side and winding side light guides (51) (54
) returns to the tape loading start position in (150).

At the same time, pull out the supply side and take-up side drawer levers <9
2) (98) and the pinch roller lever (82) also return to the tape loading start position in the cassette.

In addition, in parallel with the return operation of the guide bodies (51) and (54), the take-up reel stand (22) was driven in the tape winding direction and extended toward the head cylinder (11) as described later. The magnetic tape (151) is rewound into the cassette.

Note that the reel chassis (2) does not stop in the standby mode and shifts to the next eject mode l\.

■ Transition from standby mode to eject mode By rotating the power shaft (34) in the opposite direction of the arrow from the standby mode shown in Fig. 20, the power shaft (34) changes as shown in Fig. 23.
34) is driven in the axial direction, and along with this, the slide plate (
144) moves against the torsion spring (145),
As a result, the holder lock release operation shown in FIGS. 32 to 34 is performed, and the cassette holder (20) is raised.

In the eject mode shown in Fig. 23, the third detection switch (1
It is detected that 100m5ec has passed since the closing of the loading motor (32).
will be stopped.

1 Sat ■ Tape slack handling method During tape rewinding, if the magnetic tape stops at the cylinder circumferential surface due to friction between the head cylinder and the tape, this causes tape slack between the cylinder and the capstan. In order to wind up this tape slack, a program is set to carry out the operation shown in FIG. 38.

The tape slack processing method will be described below with reference to FIG. 38.

When tape slack occurs between the head cylinder (11) and the capstan (12) during tape rewinding, only the rotation of the supply reel stand (21) stops, but this is detected by the supply reel rotation sensor (138). Detected by (
Figure 38 (181)). Based on this detection, the rotation of the capstan (12) is temporarily stopped ((182) in the figure), and then the loading motor (31> is started in the unloading direction, and the capstan (182) of the pinch roller (81) is 1
2), and then remove the capstan (12).
The magnetic tape is rotated in the FWD direction (the direction in which the magnetic tape is taken up and sent out to the reel stand) at a speed seven times that of normal playback (see figure (1).
83)) to rotate the take-up reel stand (22) in the tape winding direction. Then, when the supply reel stand (21) starts rotating, or after 5 seconds have elapsed, the capstan (12) and head cylinder (1
1) is stopped ((184) in the same figure).

This causes the tape slack to be taken up on the take-up reel.

After that, only the power OFF command will be accepted for eject operation creation.

The purpose of the 5 second timer operation is to protect the tape if the supply reel stand (21) does not rotate for some reason.

■ Tape unloading method During the unloading operation of the reel chassis (2), the reel chassis (2) or cassette holder
When there is an obstacle in front of the reel chassis (20) that prevents the movement of the reel chassis (2), the loading motor (31)
The power generated from the reel chassis acts as a load on the mechanism from the loading motor (31) to the reel chassis 2), and there is a risk of damaging the mechanism.

Therefore, in this VTR, by setting the driving voltage of the loading motor (31) during unloading of the reel chassis (2) lower than that during loading (sections T2, T3, T4 in FIG. 36), The above damage is kept to a minimum.

The reason why the driving voltage for unloading can be lower than that for loading is that no load is applied to draw out the tape during unloading, and the driving force required for unloading is smaller than that for loading.

FIG. 36A(,)(b) shows the drive voltage supplied to the loading motor (31)/\ during loading and unloading, respectively.

During loading, a DC voltage of <5V is sent to the loading motor (31) as shown in Figure 36A (,).

On the other hand, during unloading, a pulse width modulated drive pulse with a period of 20+*sec and a duty of 40% is applied to the loading motor (31) as shown in FIG. 36A.
As a result, the loading motor (31) is driven with a voltage smoothed to about 2.

■ Tape winding method ratio during unloading In a VTR, when the loading motor (31) is started in the unloading direction from the ready mode shown in Fig. 21, the rotation of the worm (35) is caused by the rack (36). The first gear (71) of the gear mechanism (7) rotates intermittently, consisting of the above-mentioned arcuate convex surface (73a) and arcuate concave surface (75a). Due to the operation of the mechanism, the ring gear (6) (6
1), and after a predetermined time delay from the start of movement of the reel chassis (2), the upper gear (73) of the first gear (71) transfers to the lower gear (75) of the second gear (74).
The supply side and the winding opening body (51)
The unloading operation (54) is started.

Therefore, in the process of moving only the reel chassis (2), as the cassette on the reel chassis (2) moves,
The magnetic tape is pulled out from the cassette, and the leader (
51) and (54) move in the unloading direction, causing tape slack.

Therefore, in order to wind up the tape slack, the following configuration has been adopted.

Figures 36(,) to (e) show the timing of various control signals generated during unloading.
) shows the LO^D END signal that becomes H" when the first detection switch (130) opens, and (b) of the same figure shows the LO^D END signal that becomes "" when the second detection switch (131) opens.
It shows the LO^D TOP signal which becomes "H" and becomes "L I+" by closing the third detection switch (132), and (c) shows the cylinder ON signal for starting the head cylinder (11). , the same figure (d) is,
The figure shows a capstan ON signal for rotating the capstan (12) in the FWD direction, and (e) also shows an unloading ON signal for starting the loading motor (31) in the unloading direction. .

Further, FIG. 39 explains the program set in the system controller.

The tape winding method during unloading will be described below with reference to FIGS. 36 and 39.

When unloading from stop mode,
First, the head cylinder (11) is started, and the pinch roller (81) is released from the pressure (section T+ in Fig. 36).
, (185) to (186)) in FIG. 39 are carried out to shift to the ready mode. After that, as shown in FIG. 36(d), 1
After 00-8ee, the capstan (12) is 30m5
ecRVs direction (direction in which the tape is rewound onto the supply reel)
Rotate at 1x speed (normal speed) ((187) in the same figure),
As a result, the idler gear (112) appears as shown in Fig. 26.
Set to neutral position. Also, when unloading from ready mode, head cylinder (11)
After starting up, immediately turn the capstan (12) (1
87) Let. In this way, the idler gear (112) is set to the neutral position by the guide body (51) (
This is to allow the tape to be pulled out from both reels when the reel chassis (2) moves while the reel 54) is stopped.

Next, the loading motor (31) is activated in the unloading direction, and the reel chassis (2) is moved toward the standby mode position. After that, Fig. 36 (,)
After the END signal becomes "H", the capstan (12) is rotated in the FWD direction.

In this way, during the period when only the reel chassis (2) is moving (section T2 in Figure 36), the capstan (12) is stopped to prevent the tape from shifting as it is wound onto the take-up reel. It is prevented.

300m5 after LO^D END signal becomes 'H'
During the ec period (section T3 in Fig. 36), the capstan (
12) at 5x speed (Fig. 39 (188)), and then the period up to the eject mode (section T in Fig. 36).
, and T) rotate the capstan (12) at nine times the speed ((189) in the figure) to wind up the magnetic tape pulled out from the cassette onto the take-up reel.

In this way, the leading bodies (51) (54) on the supply side and the winding side
) starts moving for a short period of time, the capstan (1
The reason why the rotation speed in 2) is set low is due to the following two reasons. In other words, the moving speed of the leading body immediately after the start of movement is the second
By engaging the first gear (71) and the second gear (74) at the pressing surfaces (73b) shown in FIG. 4, both gears (71) (7
4) is lower than when meshing with normal tooth surfaces,
The amount of tape slack accompanying the movement of the guide body is small at first, and then increases. Therefore, for a short period immediately after the guide body starts moving, the tape winding speed is slowed down to prevent the tape from shifting due to unloading. Also, as shown in Fig. 36, it is inevitable that a certain amount of lag will occur between the time when the LO^D END signal becomes H° and the time when the guide body actually starts moving. This is because if the start of movement is delayed and the tape is wound at high speed from the beginning, the tape will be misaligned.

When the period T in Fig. 36 has passed and the unloading of the reel chassis (2) is completed, the <LO
^D TOI' signal becomes L゛°.

After the LO^D TOP signal becomes "L", the loading motor (31) is further rotated in the unloading direction for a period of 100m5ec with the normal drive voltage (5■) (Fig. 39 (190)). to unlock the cassette holder (20).

Finally, loading motor 31〉, capstan (1
2) and the head cylinder (11) is stopped (FIG. 39 (191)) to complete the procedure.

As a result, the tape is smoothly pulled out at the start of unloading, and the unloading operation is performed without causing any major deviation in tape position or tape slack.

■ Tape processing method when the cylinder is stopped As mentioned above, in the stop mode, the capstan (12) and head cylinder (11) are removed without releasing the pinch roller (81) from the capstan (12). will be stopped.

This is to quickly transition from stop mode to play mode.

However, in this case, in order to smoothly start the head cylinder (11) from stop mode, it is necessary to give some tape slack to the magnetic tape between the head cylinder (11) and the capstan (12). be.

Therefore, when shifting to the stop mode, the capstan is rotated in the RVS direction for a certain period of time to intentionally loosen the tape. However, simply rotating the capstan (12) in the RVS direction will prevent the 31st
As shown in the figure, the supply reel stand (21) is rotated by the drive of the idler gear (112), causing a problem in which the tape is rewound, so the following measures have been taken.

That is, when shifting to the stop mode, first move the oscillating idler (110) to the take-up reel stand (as shown in FIG. 30).
22) Engage the side l\ and in this state start the capstan motor (13) in the RVS direction, during the swinging period until the swinging idler (110) moves to the supply reel stand (21) side. Then, feed the tape to the head cylinder (11) using the capstan (12),
This causes the tape to become loose.

In order to realize the above operation, the following configuration is adopted.

Figure 37 (a) (b) (c) shows the capstan ON signal sent from the system controller (180) to the driver (13a) of the capstan motor (13) and the capstan motor rotating in the RVS direction. The timing of the capstan RVS signal is shown.

When shifting from play mode to stop mode, since the oscillating idler is already engaged with the take-up reel stand side in play mode, the capstan must be moved for a period of 50 m5ec as shown in Figure 37 (,). , rotate in the RVS direction at 1x speed to loosen the tape.

When transitioning from CUE (fast forward playback) mode or FF (tape fast forward) mode to stop mode, the amount of slack given to the tape is the same as when transitioning from the play mode to the stop mode, as shown in FIG. As shown in Figure b>, after stopping the rotation of the capstan, the capstan (IZ) is rotated at 1x speed in the FWD direction for about 1 second, and the same state as in Figure (a) is set. After that,
Loosen the tape by doing the same operation as in Figure 4(a).

Also, when changing from REV (rewind playback) mode or REW (tape rewind) mode to stop mode,
Since the oscillating idler is engaged with the supply reel stand side, first stop the capstan, then rotate the capstan at 1x speed in the FWD direction for about 1 second, as shown in Figure 37(c), and then After the swing idler is engaged with the supply reel stand side, the tape is loosened by the same operation as shown in FIG.

As a result, the head cylinder can be started up smoothly even from the stop mode, that is, the head cylinder stops rotating with the pinch roller pressed against the capstan.

(2) Tape End Processing Method As mentioned above, during tape loading, by pulling out the tape from both the supply reel and the take-up reel, damage to the tape due to friction between the head cylinder and the tape is minimized.

However, when loading the tape, if the cassette in the holder is at the end of the tape, the tape is pulled out only from the take-up reel, which may cause damage to the tape.

Therefore, if the cassette is at the end of the tape when tape unloading is started, unloading is performed after the tape is rewound by the amount of tape drawn out from the supply reel accompanying tape loading. Therefore, when the cassette is removed from the VTR and then loaded into the VTR again for tape loading,
The tape will be pulled out from both wheels.

In order to realize the above operation, a program shown in FIG. 40 is set.

When an eject command is issued from the operation panel, the tape top sensor (137) and tape end sensor (136) determine whether the cassette is in the tape top state or not, and whether the tape end state is in the tape end state. (Figure 40 (192) (193) (194)
)).

If both the tape top sensor and tape end sensor are ON, it is determined that no cassette is loaded in the cassette holder, and the eject operation is performed ((195) in the same figure).
Do this.

If the tape top sensor is ON and the tape end sensor is OFF, or if both sensors are OFF, the eject operation (
195).

Also, if the tape top sensor is OFF and the tape end sensor is ON, the cassette is at the tape end, so after starting the head cylinder (11), press the pinch roller (81) to the capstan (12). (Figure 40 (196)).

Thereafter, the capstan (12) is rotated for 1 second in the RVS direction at 7x speed to rewind the tape as described above.

Next, after stopping the capstan (12), an ejecting operation (195) is performed.

As a result, when a cassette in which signals have been recorded or reproduced up to the end of the tape is loaded into a VTR again for tape loading, the tape is pulled out from both reels of the cassette, thereby preventing damage to the tape.

The drawings and the description of the above embodiments are for illustrating the present invention, and do not limit the invention described in the claims.
Nor should it be construed as limiting the scope.

Further, it goes without saying that the configuration of each part of the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the technical scope of the claims.

[Brief explanation of the drawing]

FIG. 1 is a front view of the VTR according to the present invention in eject mode, FIG. 2 is a right side view of the same, FIG. 3 is a right side view of the same in standby mode, and FIG. 4 is a right side view of the same in play mode. Fig. 5 is a plan view showing the main mechanism of the VTR in standby mode, Fig. 6 is a plan view of the same as above in ready mode, and Fig. 7 is a plan view of the same as above in play mode. 8 is a perspective view of the VTR in play mode, FIG. 9 is a perspective view of the same as above in eject mode, FIG. 10 is a partially exploded perspective view showing the mechanism on the main chassis, and FIG. The figure is a partially exploded perspective view of the cylinder unit, Figure 12 is a partially exploded perspective view of the gear mechanism driven by the loading motor, and Figure 13 is a partially exploded perspective view of the cylinder unit.
The figure is a perspective view of the oscillating idler and regulation plate, Figure 14 is a front view of the fourth gear, Figure 15 is a perspective view of the power shaft and mode lever, and Figure 16 is an exploded perspective view showing the mechanism on the reel chassis. Figure 17 is an exploded side view of the cassette holder and holder elevating m, Figure 18 is a plan view of the mechanism installed in the main chassis, Figure 19 is a rear view of the mechanism installed in the reel chassis, Figure 20 The figure is a plan view of the power shaft and the mechanism connected to it in standby mode, Fig. 21 is a plan view of the same as above in ready mode, Fig. 22 is a plan view of the same as above in play mode, Fig. 23 24 is an enlarged plan view showing the engagement state of the first gear and the second gear on the pressing surface, and FIG. 25 is the pinch roller crimping mechanism in standby mode. 26 is a plan view of the same as above in ready mode, FIG. 27 is a plan view of same as above in play mode, FIG. 28 is a plan view of the reel stand drive mechanism in standby mode, Fig. 29 is a plan view of the same as above during loading, Fig. 30 is a plan view of the reel stand drive mechanism and pack tension lever mechanism during normal playback in play mode, and Fig. 31 is a plan view of the same as above in play mode. Plan view of the same as above during reverse playback, No. 32
The figure is a left side view of the boulder lock mechanism in standby mode, Figure 33 is a left side view of the same as above showing the lock release operation, Figure 34 is a left side view of the same as above in eject mode, Figure 35 is A block diagram showing the control circuits of the capstan motor and loading motor, FIG. 36 is a timing chart of various control signals during unloading, and FIG.
Figure 6A is a waveform diagram showing the driving voltage of the loading motor.
FIG. 37 is a timing chart explaining the tape processing method when the cylinder is stopped, FIG. 38 is a flowchart explaining the tape slack processing method, FIG. 39 is a flowchart explaining the tape winding method during unloading, and FIG. 40 41 and 42 are side views illustrating the operation of the conventional apparatus. (1) Main chassis (11) Head cylinder (2) Reel chassis (21) Supply reel stand (22) Take-up reel stand (20) Cassette Holder (31)...Loading motor (34)...Power shaft (4)...Mode Renoku (81)...Pinch roller (87)...
Slider (92)...Back tension lever (1
10) Swing idler (128) Lock bin (146) Mouth/Tsuku arm (144) Slide plate (160)
・Written Amendment to Regulatory Board Procedures [Voluntary] Indication of Case Patent Application No. 63 2゜Name of Invention Apparatus for tape slack removal in recording/reproducing device Sanyo Electric Co., Ltd. 4, Agent: 4-chome, Nakamiya, Asahi-ku, Osaka, 535 No. 10, No. 12, No. 5, Drawing to be amended, Column 6 for detailed explanation of the invention in the specification, Contents of the amendment (1) "Figure 8", "Figure 9" and "Figure 30" in the drawings
Corrected to Appendix r Figure 8, r Figure 9 1 and r Figure 30 1.

Claims (1)

[Claims] [1] A capstan (12) driven by a capstan motor (13) is provided on the tape running path from the head cylinder (11) to the take-up reel, and the magnetic tape is a rotation detecting means for detecting the rotation of a supply reel stand (21) and a take-up reel stand (22), respectively, in a signal recording and reproducing apparatus that conveys a magnetic tape by pressing the magnetic tape onto a capstan (12); The control means controls the operation of the capstan motor (13) and the pinch roller crimping mechanism (8) based on the detection signal of the detection means, and the rotating When the detection means detects that only the supply reel stand (21) has stopped rotating, the detection signal is sent to the control means, and the control means separates the pinch roller (81) from the capstan (12) and , generates a control signal to reverse the capstan motor (13), and then, when the rotation detection means detects the start of rotation of the supply reel stand (21), the detection signal is sent to the control means, and the control signal is sent to the control means. The means are
A tape slack processing device characterized in that it generates a control signal to stop a capstan motor (13).